Corner-lock for cement-molds.



No. 881,224. PATENTED MAR. 10, 1908.

- H. A. OARMIOHABL.

CORNER LOCK FOR CEMENT MOLDS.

APPLICATION FILED JULY 29, 1907.

K w QY N HUGH A. CARMIOHAEL, OF WEST LORNE, ONTARIO, CANADA.

CORNER-LOCK FOR CEMENT-MOLDS.

Specification of Letters Patent.

Application filed July 29, 1907.

Patented March 10, 1908. Serial No. 385,950.

To all whom it may concern:

Be it known that I, HUGH A. CARMICHAEL a subject of Great Britain,residing at West Lorne, county of Elgin, Province of Ontario, Canada,have invented a certain new and useful Improvement in Corner- Looks forCement-Molds, and declare the following to be a full, clear, and exactdescription of the same, such as will enable others skilled in the artto which it pertains to make and use the same, reference being "had totheaccom nying drawings, which form a part of this specification.

My invention relatesto an improvement in corner locks for cement moldsand more especially those employed in the manufacture of window sills,fence posts, etc., shown in the accompanying drawings and moreparticularly pointed out in the following specification and claims.

In the drawings: Figure 1 is a perspective view of the mold showing thecorners unlocked as they would appear when the block is to be released.Fig. 2 is a detail view in perspective showing one of the lockingdevices as it would appear when in position upon the mold, showing theside and end Walls in locked relation.

The object of my invention is to put on the market a locking device forthe corners of cement molds which while it is simple in c0nstruction,-inorder to reduce the cost of manufacture and also to avoid the liabilityof getting out of order,-is positive and uniform in its action, theparts operating to lock together the side and end walls of the moldperfectly square.

Provision is made whereby the length of the mold proper may be increasedor reduced by merely shifting the location of the locking device on theside walls of the mold which is accomplished by removing the scrplwsengaging the locking device to the we Another advantage in the use of myinvention is that it is not necessary to crate it for shipment as inother forms of molds, as none of the working parts in this inventionextleid beyond .the ends of the walls of the mo Another advantage isthat any individual corner may be operated singly if desired.

Other advantages will hereafter appear.

Referring now to the letters of reference shown on the drawings :Arepresents'the side, and B the end walls of the mold.

' O is a plate bolted or otherwise secured to the inner face of each ofthe projecting ends of the side walls A.

-D is a bell-crank-lever pivoted in the lugs 0 formed integral with theplate C. One arm of the lever D is in the form of a handle whereby itmay be manually operated, the other arm has at its swinging end a hub d,to which is pivoted the link E in turn hinged to the late F secured tothe wall B near its end. .t being understood that similar plates F aresecured to both ends of each of the walls B, to which are engaged theirrespective connecting elements :the locking devices for each cornerbeing identical.

C is a channel formed in the plate O opening toward the back to receiveone end of the link G.

H is a late fastened to the wall B having a channe ed ortion h alsodesigned to receive 1cgne end of t e link G,the ends of the link em overap the ends of the channeled portion of the plate, in order to secure itto the latter.

-H is a wearing plate located back of the plate H to protect the wall ofthe mold from wear occasioned by themovement of the link G, and O is asimilar wearing plate located back of the plate C for a like purpose.

I indicates strap-iron secured to the edges of the walls forming themold, to protect them from wear.

J is a truss engaging the side walls of the mold to stiffen the latter.

Having indicated the several parts by reference letters, the operationof the device will be easily understood. The several walls forming themold being linked together in the manner shown, they are locked in rigidrelation by manually forcing the handle of the bell-crank lever towardthe end wall, this action causes the pivotal connections between thebell-crank lever and the link engaging the plate F to pass an imaginaryline (see dotted line) drawn from the pivotal connection e of the link Ewith the plate F, to

bent outwardly as indicated at g to the pivot d of the bell-crank lever,thereby securing the parts in locked relation as will be readilyunderstood. To release the parts, the bell-crank lever is thrown in theopposite direction to that just described.

Having thus described my invention, What I claim is 1. In a lockingdevice for cement molds, a bell-crank lever pivoted to one of the Wallsof the mold, a link connecting one arm of said lever With the welllocated at right angles to the first named Wall, and a separate linkconnection between said, Walls.

2. In a locking device for cement molds, a. plate; secured to one of theWalls of said mold having bearings to support a bellcrank lever, abell-crank lever supported in said bearings, a plate secured to the Walllocated at right angles to the first mentioned Wall, a link connectionbetween said last named plate and with one arm of the bell crank lever,and a separate link connection between said Walls.

3. In a locking device for cement molds, a plate secured to one of itsWalls having bearings for a bell-crank lever, said plate also adapted tosupport a link connecting it with the Wall of the mold at right anglesto that first mentioned, a bell-crank lever pivoted in the plate andhaving a linked connection with the last named wall of the mold, a platesecured to said last named wall adapted to be engaged by a separate linkalso engaging the first named plate, and the said link, substantially asdescribed.

In testimony whereof, I sign this specification in the presence of twowitnesses.

HUGH A. CARMICIIAEL.

\Vitnesses:

SAMUEL E. TnoMAs, GRACE E. VVYNKooP.

